linux-ext4 - Re: [PATCH] libext2fs: clamp block-map punch range end to 2^32 blocks

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Message-ID: <20131215004858.GA15593@thunk.org>
Date:	Sat, 14 Dec 2013 19:48:58 -0500
From:	Theodore Ts'o <tytso@....edu>
To:	"Darrick J. Wong" <darrick.wong@...cle.com>
Cc:	linux-ext4@...r.kernel.org
Subject: Re: [PATCH] libext2fs: clamp block-map punch range end to 2^32 blocks

On Thu, Dec 12, 2013 at 01:13:25PM -0800, Darrick J. Wong wrote:
> In the ^extent case, passing ~0ULL as the 'end' parameter to
> ext2fs_punch() causes the (end - start + 1) calculation to overflow to
> zero.  Since the old-style mapped block files cannot have more than
> 2^32 blocks, just clamp it to ~0U.
> 
> This fixes a regression in t_quota_2off with the patch "libext2fs: use
> ext2fs_punch() to truncate quota file" applied.
> 
> Signed-off-by: Darrick J. Wong <darrick.wong@...cle.com>

Thanks, applied.

					- Ted
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